Subsurface packer



y HQM. BUCK Erm. 2,856,006

oct. 14,1958- AsusuRi-zxclz PAcxER :s sheets-sheet 2 Filed Aug. 3, 1 956FIG. 9.`

oef. 1'4, 195s Filed Aug. s, 195s Sheets-Sheet 3 MONITORQ INDICATOR |72EQUIPMENT 3 VOLTS Y l f FIG. I3. 12 V 2 l 3 l I I3 A.- D. c.

\ SWITCH POWER 7o SUPPLY l I7! l22\ CABLE SHEATH l 2.

PRoTEcTlNG REslsToR I w /wl RELAY l74-. |7

INVENTORS.

Robert C. Rumble, vHenry M. Buck,

Beldon A. Peters, BY

ATTORNEY.

United States Patent O SUBSURFACE PACKER Henry M. Buck, Beldon A.Peters, and Robert C. Rumble, Houston, Tex., assignors, by mesneassignments, to Jersey Production Research Company Application August 3,1956, Serial No. 602,047

12 Claims. (Cl. 166-187) This invention is directed to a surfaceoperable packer for use in well bores and the like. More specificallythe invention is directed to an electrically operated inflatable packerfor use in combination with a fluid meter which is adapted to givesurface indications of rate and direction of iluid ilow in well bores.This invention is also directed to an electrically operated packer whichis lluid expansible and preformed to provide circumferentially spacedlongitudinally extending pleats.

This device is designed to overcome inadequacies of packers adaptablefor use with subsurface llowmeters. Accordingly, one object of thisinvention is to provide a surface operable packer for use with asubsurface ilowmeter, which is surface indicating, the packer andilowmeter being designed to be run through tubing, whereby the packermay be selectively and controllably inated and deated and themeasurement of fluid llow rate and direction may be made at any selectedpoint in the borehole.

Another object of this invention is to provide a reversible packer pumpwhich is adapted to inflate the packer when operated in one directionand to permit dellation of the packer when operated in a reversedirection.

For rates of ilow up to as much as 140 barrels of fluid per day thedevice will seal the borehole and divert all iluid ilow through themetering section of the device. For higher rates a measurable portion ofthe iluid ilow can be diverted through the device so that the total ilowcan be derived from this measured portion. Further, the device isreadily adaptable to give surface indication of the degree of pack-oilof the packer element.

Essentially, the invention consists ofa reversible electric motor, apump, and a packer adaptable for use with a flowmeter. An electricalcircuit connects the motor and the tlowmeter whereby the motor may beactuated to inflate or deflate the packer, and the ilowmeter is employedto register the rate and direction of fluid tlow.

Referring to the drawings:

Figs. l through 4 are sectional views from top to bottom, respectively,of the device of the present invention;

Fig. 5 is an enlarged `sectional View taken along the line 5 5 of Fig.2;

Fig. 6 is a sectional view taken along the line 6 6 of Fig. 3;

Fig. 7 is an elevational view of the rotatable helical cam of Fig. 2;

Fig. 8 is a sectional View taken along the line 8 8 of Fig. 2;

Fig. 9 is a sectional view of the pump section of l Figs. 2 and 3 inpacker inilating position;

Fig. 10 is an elevational view of a preferred packer for use in thedevice of the present invention;

Fig. l1 is a sectional View taken along the line 11 11 of Fig. l0;

Fig. 12 is an elevational view of the device of the present inventionpositioned in a well bore; and

Patented Oct. 14, 1958 Fig. 13 is a schematic diagram of the electricalcircuitry employed in the operation of the device of the presentinvention.

For a clearer understanding of the elements and operation of thisdevice, reference to the figures in greater detail will now be made.

Figs. l through 4 are sectional views illustrating from top to bottomthe elements of the present device. The device consists essentially offour sections. These are a pressure sealed motor section 11, a pumpsection 12, a packer section 13, and a ilowmeter section 14. Section 11(Fig. 1) consists of a hollow cylinder 15 which has connected to itsupper end a fishing neck 16. This connection is pressure sealed by meansof an O-ring not shown. A cable 20, consisting of an outer steel sheath21 and an inner insulated conductor 22, is shown connected to shing neck16. The cable 20 extends to the surface of the earth and forms part ofthe electrical circuit to be described later herein. The lower end ofcylinder 15 is connected to a wall member 23 by means of threads 24 anda pressure seal is maintained at this connection by means of O-ring 25.Positioned in section 11 as shown is a reversible motor, such as apermanent magnet motor, 29.

A housing 30 is attached to and shouldered against wall member 23 bymeans of threads 32. Motor 29 is mounted in housing 30 and connectedthereto by means of set screws 31. The lower end of housing 30 holds theouter race of a thrust bearing 33. A shoulder 34 formed on wall member23 provides a stop for housing 30. A shaft 35 of motor 29 is connectedto a coupling 37 by means of a pin 36. An opening in the lower end ofcoupling 37 is hexagonal in cross section in order to engage with theupper end of a shaft 38 which is milled to a hexagonal cross section as`shown `on its upper end. Shaft 38 extends through the inner race ofthrust bearing 33 and is prevented from moving upwardly by a flange 39formed on shaft 38. The lower end of shaft 3S below flange 39 has areduced diameter and is provided with a milled polygonal cross sectionfor driving a helical cam 40.

The pump section 12 consists of a cylinder 41 which is connected to wallmember 23 by means of threads 42 and to a lower wall member 43 by meansof threads 44. A fluid seal surrounding the lower end portion of shaft38 consisting of a bronze bushing 50, an O-ring 51, and felt washers 52,is housed in a removable holder 45 which in turn is pressure sealed towall member 23 by means of an O-ring 46. Grease escape ports 50a areprovided in bronze bushing 50 to allow O-ring 51 to deform and cause apositive iluid seal between rotating shaft 38 and holder 45 when fluidpressure is exerted below packing 52 and O-ring 51. Holder 45 and thesealing elements 5(1 52 are maintained in position by a shaft aligningwasher 48 which is held by screws 49 threaded into wall member 23.

A cylinder 53 is shown (Figs. 2, 3 and 9) screw threadedly attached towall member 43 as at 44a and is also attached at its upper end to a camshaft holder 54 by means of screws 54a. Cylinder 53 has formedintermediate the length thereof longitudinal `slits 55 and 55a and hasformed adjacent its lower end iluid drain'ng ports S6. Cylinder 41 isprovided with fluid entry and draining slits 57 positioned adjacentports 56.

Cam shaft holder 54 contains a sleeve bearing 58 and is formed toprovide a longitudinally extending port 59. A shaft 6i), attached at itsupper end to helical cam 40 by means of-pin 61, may rotate freely inbearing 58. A washer 62 serves as a bearing between rotatable cam 40 andcam shaft holder 54. The upper end of cam 40 is a hollow cylinder whichcontains an engaging member 63 which latter member is formed with a holehaving a square cross section in its upper end which is adapted toengage the lower end of shaft 38. Engaging means 63 is held in cam 40 bya pin 64 which is free to move longitudinally in yslot 65 in cam 40 andis biased upwardly by a coil spring 66 supported on the upper end ofshaft 60. The lower end `of shaft 60 is connected to a pawl holder 67 bymeans of a pin 68.

Pawl holder 67 `carries two identical but oppositely directed pawls 69and 70 mounted on a common pin 71, as more clearly seen in Fig. 5. Pawlbiasing spring 72 is mounted on a pin 73. The lower end of pawl holder67 spears into a bearing recess in a pawl follower 74, the bearingrecess being provided with a relief slot 77. Pawl follower 74 isprovided with a key 75 which projects internally from the pawl followerwall. A plurality of drain holes 76 permits drainage of any fluid orsediment that may enter pawl follower 74. The pawl follower 74 isthreadedly engaged to and movable in a wall member 78 by means ofthreads 79. Wall member 78 is affixed to cylinder 53 by means of screws80. The lower end of pawl follower 74 is free to rotate in a cylinderhead 81 but is constrained from longitudinal movement by means -of awasher 82 positioned on the lower end of pawl follower 74.

The cylinder head 81 forms the upper end of a pump cylinder 83 and isconnected thereto by means of a screw 84 which is free to movelongitudinally in a slot 85 formed in cylinder 53. The lower end of pumpcylinder 83 is mounted on shoulder 88 of stinger 86 and is threadedlyconnected to stinger 86 by means of threads 87. Stinger 86 is providedwith a fluid exhaust port 89 and an O-ring 91. The upper end of stinger86 supports a spring 92 which in turn bears against a check member 93positioned in a port 94 formed in the lower portion of cylinder 83. Thispermits only downward flow through port 94 in pump cylinder 83. Thepiston 95 is slidably arranged in pump cylinder 83. The piston 95 isprovided with a uid entry port 96, check 97, biasing spring 98, cupwasher 99 and a retainer 100 which latter is threadedly connected topiston 95. Piston 95 is connected to a piston rod 102 by means of a pin103. The piston rod 102 extends through a slit 104 formed in pumpcylinder 83. Slit 104 in cylinder 83 and slit 55a in cylinder 53 are inalignment.

The upper end of piston rod 102 is attached to a cam follower wheel 105by means of an axle 106. Cam follower wheel 105 moves in a continuoushelical slot 107 in cam 40. Piston rod 102 extends through an opening incam shaft holder 54 and moves longitudinally in a keyway 108 formed in acylinder 109 which latter is attached at its lower end to cam shaftholder 54 (Figs. 2 and 8).

The packer section 13 consists of a tubular mandrel 115 which ispreferably silver soldered to a packer stinger 116 which is pressuresealed from packer adapter 110 by means of O-ring 117. Stinger 116shoulders against a ledge 119 formed in packer adapter 110 and the upperend thereof extends into a passageway 120 in wall member 43 where a uidseal is maintained by means of an O-ring 121. Stinger 116 is providedwith a longitudinally extending passageway 123 communicating withtransverse ports 124 formed in tubular mandrel 115 which` is thickwalledat its upper end and threadedly connected into the lower end of adapter110. A plurality of longitudinally extending passageways 126 areprovided throughout the length of the thick walled portion of mandrel115 and these passageways fluidly communicate with ports 124 as seen inFigs. 3 and 6. A series of fluid inlet and outlet ports 127 extendthrough the upper end of mandrel 115 between the passageways 126. A plug128 screws into the bottom of stinger 116 in line with passageway 123.

A packer 129 is mounted on mandrel 115 with its upper end clamped byclamping ring 130 and threaded nut 131 while its lower end is clamped byclamping ring 132 and threaded nut 133. The latter is threadedly mountedon sleeve 134 which is, in turn, slidable on mandrel 115. A

fluid seal is maintained between sleeve 134 and mandrel by O-ring 136.Sleeve 134 may be locked on mandrel 115 in any desired position by setscrews 135. As shown in Fig. 3, passageways 126 fluidly communicate withthe interior of packer 129. Packer mandrel 115 is threadedly connectedto the lluid metering section 14 as at 137.

The packer 129 may consist of a preformed oil resistant rubber elementhaving a maximum diameter approximating the diameter of the boreholewherein the flow measurement is to be made. The oil resistant rubberelement may be reinforced with fabric so that it may be inflated to adefinite size to form a selected sized baffle which would provide acontrolled fluid bypass in the borehole when measuring large rates offlow. From a measure of the amount of well fluid being diverted throughthe device, the total fluid flowing in the wellbore may readily bederived. With this type of packer a small pressure release valve may bescrewed into stinger 116 in the hole plugged off by plug 128. Therelease valve will assure that the packer is always inflated to theproper pressure.

Regardless of the variety of packer employed, protection of the packeris necessary when being run into the well. The protection may beafforded by a thin enveloping rubber sheath which has a smalllongitudinal slit therein. This sheath will fail and fall away when thepacker enclosed by the sheath is inflated. Instead of a sheath,protection for the packer may be afforded by rubber bands positioned atrandom along the packer length. In this instance, ination of the packerin the well will cause these bands to slip toward the packer ends.

Although any of the indicated packer types may be used, the packer 129,as shown in Figs. l0 and ll, is preferred.

The packer element 129 is preformed of `oil resistant rubber or otherelastic material to assume in its cornpletely relaxed position the shapeas shown in Figs. l0 and 1l. Each end of the packer 129 is tubular inshape with a major portion of its walls forming longitudinally extendingpleats 160. The pleats 160 provide for substantial enlargement of thepacker without excessive stretching. A packer so formed, when mounted ona device such as the present invention in its relaxed state, does notextend outwardly beyond the nominal diameter of the device. This featureeliminates tearing of the packer element while raising or lowering thedevice in the borehole.

The fluid metering section 14 is the same as that described in U. S.application Serial No. 525,916 in the name of H. M. Buck, led August 8,1955, entitled Flowmeter. Any type of flowmeter which is adapted toelectrically transmit rate or direction of fluid ow or both to theearths surface may be used in combination with the motor, pump andpacker of this device. However, the meter disclosed in theabove-entitled application is preferred. Since this meter has beendescribed in detail in the above-cited application, a detaileddescription of the elements of this apparatus is not considerednecessary. The essential parts are as follows: a nose plug is connectedto a cylindrical member 141 which, in turn, is screw threadedlyconnected to mandrel 115 at 137. The cylindrical member 141 is providedwith fluid inlet ports 141a. A rotor 144 is mounted on a shaft 1440 andstator deectors 142 and 143 are mounted below and above the rotor 144,respectively. A cam 145 is formed on shaft 144:1 and a circuit spinnerbreaker 146 which also acts as a cam follower is positioned so as tobear against the cam 145 and is arranged to move in response to rotationof the cam 145 and to make and break contact with switch contact 146:1in response t-o this movement. Cam 145 is designed to cause camfolloweror circuit breaker 146 to make and break contact with switchcontact 146:1 in one sequence when the cam rotates in one direction andin a different sequence when the cam is rotated in an oppositedirection. Thus, coded signals are generated which are transmitted tothe earths surface as described hereinafter. The difference in thesignals indicating direction of flow through the meter and the rate atwhich the signals are transmitted indicating rate of fluid flow throughthe meter.

An electrical conductor lead 147 connects to switch contact 146a andextends through-out the length of the device and into the motor section11 where electrical connection is made with conductor 22 as shown moreclearly in the electrical circuit diagram of Fig. 13. Although conductorlead 147 is shown as one continuous lead, it is obvious that a number ofslip ring connections would be included in order to threadedly assemblethe various sections.

Fig. 13 shows schematically the electric circuitry involved in theoperation of this device. On the surface is positioned a double polethree position switch generally designated 170, a D. C. power supply171, and monitor and indicator equipment 172. The switch 178alternatively connects the monitor and indicator equipment 172 and theD. C. power supply 171 in forward or reverse directions with theconductor cable 22 housed in sheath 21. The sheath is grounded as at173. The subsurface electric circuitry connected to conductor cable 22includes relay 174, a protecting resistor 175, permanent magnet typepump motor 29 and spinner breaker 146 suitably grounded as at 176.

As shown in position 2 of switch 170, the cable 22 is connected directlyto the monitor and indicator equipment 172. In the subsurface connectionthe relay is not at this time energized since the voltage in the monitorand indicator equipment 172 is of a relatively small amount, forexample, three volts. Hence, the spinner breaker 146 is connectedthrough relay Contact 177, resistor 175, lead 147, directly to the cable22. In this position the flowmeter functions as the spinner described inthe Buck application noted supra. With the switch 170 in position l or3, the D. C. power supply is connected to cable 22. This voltage beinghigher, for example 65 volts, actuates the relay 174 so that the appliedvoltage is connected to the pump motor 29 through contact 178 of relay174. Pump motor 29 rotates shaft 38 clockwise or counterclockwisedepending `on whether surface switch 170 is in position 1 or 3.

In operation, the device is lowered in the well with the packer 129 in adeflated condition and with the switch 170 in position 2, as shown inFig. 13. At a depth at which it is desired to take a reading, verticaltravel of the flowmeter is arrested. Then switch 170 is thrown toposition l which actuates pump motor 29 which causes rotation of shaft38 in one circumferential direction which in turn rotates shaft 6i) andcam 40. Rotation of cam 40 reciprocates piston rod 102 which forcesfluid into the pump chamber 53a via ports 55a and 104 and check 97 andout pump chamber 53a through check 93. Also, pawl follower 74 movesdownwardly on screw thread 79 in wall member 78 until pawl 69 moves overthe top of key 75. This moves pump cylinder 83 downwardly carryingstinger 86 downwardly into passageway 120. O-ring 91 when positioned inpassageway 120 prevents uid from passing out ports 89 and directs lluidcoming from pump chamber 53a through passageways 120, 123, 124 and 126into packer 129 to inflate the packer.

When a seal is effected by the packer 129 in the wellbore, the switch170 is thrown back to position 2 so that a reading of the flow rate maybe made on the monitor and indicator equipment 172. After the readinghas been made and it is desired to retrieve the device or obtain anotherreading at a different depth, the packer is deflated preparatory tomoving the device by positioning the switch atposition 3 for about 1/2minute, then it is returned to position 2. This permits the packer todrain and leaves it in a condition to continue draining while raisingand lowering the device. It is equally important that the packer be opento permit draining while being raised in the borehole since thedecreased pressure at lesser depths in the well causes the gas in thevestige of oil remaining in the packer after deflation to break out ofsolution. If the packer is not in draining condition when the device israised this liberated gas would cause expansion of the packer and thuscause damage to the packer or prevent its removal from the well. Whenthe packer is sealed against the wellbore, any fluid flow in the wellwill be diverted through the metering section 14 via ports 141a and 127.When a reading or measurement of the flow reading is made, the D. C.power supply 171 is disconnected from the upper terminus of the cable 22thereby disconnecting the pump motor 29 from the power supply. When thepump motor ceases to run, the packer remains inflated. The relay 174when not energized will automatically connect the spinner breaker 146 inthe circuit for measurement of the flow direction and rate.

When the direction of rotation of the armature of motor 29 is reversedby reversing the polarity of the D. C. supply voltage 171 by moving theswitch from position 1 to position 3, the direction of rotation of pawlholder 67 is also reversed. This causes pawl 70 to engage key 75 of pawlfollower 74 which in turn causes pawl follower 74 to move upwardly withrespect to wall member 78 by means of the threaded connection 79 in wallmember 78. This results in pump cylinder 83 being moved upwardly untilthe ports 89 in stinger 86 are withdrawn from passageway 120. Byuncovering ports 89 the flow through the stinger from pump chamber 53awill pass outwardly through ports 89, 56 and 57. The ports 89 areuncovered after the motor 29 has run foi approximately 5 seconds in theclockwise direction afterwhich pawl 70 has slipped over the lower end ofkey 75. Hence, protracted running of the motor 29 in a reverse directionis not necessary to drain the packer.

Obviously, successive readings of flow rates in the well bore may bemade b'y spotting the llowmeter at the desired depth and then inflatingthe packer, making the flow measurement and deflating the packer asdescribed above. It is possible to employ attachments with this deviceto determine if the packer is being inflated or whether or not it isholding the fluid pressure. For eX- ample, it may be desirable to screwin the hole blocked by plug 128 in stinger 116 a small bellows. Thebellows, when containing a certain minimum pressure, would actuate aswitch which would remove a partial short circuit in the spinner breakercircuit. When properly adjusted this switch would be a means fordetermining if the packer is being inflated and whether or not it isholding lluid pressure.

Having described the apparatus, operation, and objects of our invention,we claim:

l. A surface operable packer comprising a longitudinally extendinghousing, driving means including a rotatable shaft mounted in saidhousing, a rotatable cylindrical cam having a helical continuous slotformed thereon ailixed to said shaft, a cam follower wheel positioned insaid slot, a rotatable pawl holder connected t0 said shaft, oppositelydirected pawls arranged on said pawl holder, a rst stationary wallmember mounted in said housing, a longitudinally movable pawl follower`screw threadedly connected to said first wall member, said pawl followerbeing formed to provide a key adjacent said pawls, said pawl holderbeing mounted on said pawl follower, said pawls being engageable withand longitudinally slidable on said key thereby rotating said pawlfollower with said pawl holder until said pawl follower moves a selectedlongitudinal distance whereby said pawl disengages from said key andsaid pawl holder rotates free of said pawl follower, a pump cylinderconnected with said pawl holder for longitudinal movement therewith,said pump cylinder having first and second positions and being formed toprovide upper inlet and lower outlet ports, a piston slidably arrangedin said cylinder, a piston rod interconnecting said cam follower andsaid piston, a first valve on said piston adapted to admit fluid to saidcylinder below said piston upon movement of said piston in onedirection, a second valve positioned on said cylinder adapted to permitdischarge of uid from said cylinder upon movement of said piston in anopposite direction, a second stationary wall member secured to saidhousing and formed to provide a fluid passageway, the lower end of saidcylinder including said outlet ports being slidably arranged in saidpassageway, sealing means on said cylinder above said outlet portswhereby fluid discharge through said second valve is directed throughsaid passageway when said cylinder is in said second position, a packeradapter connected to said second wall member, an upper packer supportsecured to said packer adapter, a fluid expansible packer having one endthereof secured to said upper packer support, said upper packer supportbeing formed to provide a plurality of passageways uidly communicatingwith said second wall member passageway, a mandrel extending throughsaid packer, a lower packer support slidably arranged on said mandrel,the other end of said packer being secured to said lower packer support,a D. C. power supply, electrical means interconnecting said drivingmeans and said D. C. power supply and means in said electricalconducting means adapted to reverse the polarity of said voltage toreverse the direction of said driving means.

2. A surface operable borehole packer comprising driving means includinga rotatable shaft; a longitudinally movable pump cylinder being formedto provide a pump chamber and fluid flow inlet and outlet ports, apiston slidably arranged in said chamber, a piston rod connected to saidpiston, means interconnecting said piston rod and said shaft adapted toreciprocate said piston rod longitudinally upon rotation of said shaft,means interconnecting said cylinder and said shaft adapted to move saidcylinder a selected longitudinal distance upon rotation of said shaft,an intake valve on said piston adapted to admit iiuid to said chamber, adischarge valve on said cylinder adapted to discharge fluid from saidchamber, a liuid inflatable packer, means interconnecting said packerand said cylinder adapted to direct fluid discharged from said pump tosaid packer to inate said packer when said cylinder is in one positionand to permit fluid to discharge from the packer when said cylinder isin another position, a source of D. C. power, electrical conductingmeans interconnecting said driving means and said power supply, andmeans in said conducting means adapted to reverse the polarity of saidD. C. voltage to reverse the direction of said driving means.

3. A surface operable borehole packer comprising a reversible electricalmotor, a reciprocating pump cylinder having first and second positions,a piston arranged in said cylinder, a uid inflatable packer, meansinterconnecting said motor and said cylinder adapted to move saidcylinder from said first to said second position when said motor isactuated in one direction and to move said cylinder from said second tosaid first position when said motor is actuated in a reverse direction,means interconnecting said motor and said piston adapted to reciprocatesaid piston, fluid flow control means interconnecting said cylinder andsaid packer adapted to direct iiuid ow from said cylinder to said packerto inflate said packer when said cylinder is in said first position andto permit deflation of said packer when said cylinder is in said secondposition, a source of D. C. supply, electrical conducting meansinterconnecting said D. C. supply and said motor, and means in saidelectrical conducting means adapted to reverse the polarity of said D.C. voltage to reverse said motor.

4. A surface operable packer comprising a longitudinally extendinghousing, driving means including a rotatable shaft mounted in saidhousing, a rotatable cylindrical cam having a helical continuous slotformed thereon affixed to said shaft, a cam follower wheel positioned insaid slot, a rotatable pawl holder connected to said shaft, twooppositely directed pawls arranged on said pawl holder, a firststationary wall member mounted in said housing, a longitudinally movablepawl follower screw threadedly connected to said first wall member, saidpawl follower being formed to provide a key adjacent said pawls, saidpawl holder being mounted on said pawl follower, said pawls beingengageable with and longitudinally slidable on said key thereby rotatingsaid pawl follower with said pawl holder until said pawl follower movesa selected longitudinal distance whereby one of said pawls disengagesfrom said key and said pawl holder rotates free of said pawl follower, apump cylinder connected with said pawl holder for longitudinal movementtherewith, said pump cylinder having first and second positions andbeing formed to provide upper inlet and lower outlet ports, a pistonslidably arranged in said cylinder, a piston rod interconnecting saidcam follower and said piston, a first valve on said piston adapted toadmit uid to said cylinder below said piston upon movement of saidpiston in one direction, a second valve positioned on said cylinderadapted to permit discharge of fluid from said cylinder upon movement ofsaid piston in an opposite direction, a second stationary wall membersecured to said housing and formed to provide a iiuid passageway, thelower end of said cylinder including said outlet ports being slidablyarranged in said passageway, sealing means on said cylinder above saidoutlet ports whereby fluid discharge through said second valve isdirected through said passageway when said cylinder is in said secondposition, a packer adapter connected to said second wall member, anupper packer support secured to said packer adapter, a Huid expansiblepacker having one end thereof secured to said upper packer support, saidupper packer support being formed to provide a plurality of passagewaysiiuidly communicating with said second wall member passageway, a mandrelextending through said packer, and a lower packer support slidablyarranged on said mandrel, the other end of said packer being secured tosaid lower packer support.

5. A surface operable borehole packer comprising driving means includinga rotatable shaft, a longitudinally movable pump cylinder being formedto provide a pump chamber and liuid flow inlet and outlet ports, apiston slidably arranged in said chamber, a piston rod connected to saidpiston, means interconnecting said piston rod and said shaft adapted toreciprocate said piston rod longitudinally upon rotation of said shaft,means interconnecting said cylinder and said shaft adapted to move saidcylinder a selected longitudinal distance upon rotation of said shaft,an intake valve on said piston adapted to admit fluid to said chamber, adischarge valve on said cylinder adapted to discharge fluid from saidchamber, a fluid inflatable packer, and means interconnecting saidpacker and said cylinder adapted to direct uid discharged from said pumpto said packer to inflate said packer when said cylinder is in oneposition and to permit fiuid to discharge from the packer when saidcylinder is in another position.

6. A surface operable borehole packer comprising a reversible motor, areciprocating pump cylinder having first and second positions, a pistonarranged in said cylinder, a fluid inflatable packer, meansinterconnecting said motor and said pump cylinder adapted to move saidpump cylinder from said first to said second position when said motor isactuated in one direction and to move said pump cylinder from saidsecond to said first position when said motor is actuated in a reversedirection,

means interconnecting said motor and said piston adapted to reciprocatesaid piston and iiuid flow control means interconnecting said pumpcylinder and said packer adapted to direct Huid ow from said pumpcylinder to said packer to inilate sai-d packer when said pump cylinderis in said first position and to permit deflation of said packer whensaid pump cylinder is in said second position.

7. A subsurface pump comprising a longitudinally extending housing,driving means including a rotatable shaft mounted in said housing, arotatable cylindrical cam having a helical continuous slot formedthereon aflixed to said shaft, a cam follower wheel positioned in saidslot, a rotatable pawl holder connected to said shaft, oppositelydirected pawls arranged on said pawl holder, a first stationary wallmember mounted in said housing, a longitudinally movable pawl followerscrew threadedly connected to said first wall member, said pawl followerbeing formed to provide a key adjacent said pawls, said pawl holderbeing mounted on said pawl follower, said pawls being engageable withand longitudinally slidable on said key thereby rotating said pawlfollower with said pawl holder until said pawl follower moves a selectedlongitudinal distance whereby one of sai-d pawls disengages from saidkey and said pawl holder rotates free of said pawl follower, a pumpcylinder connected to said pawl holder for longitudinal movementtherewith, said pump cylinder having rst and second positions and beingformed to provide spaced apart inlet and outlet ports, a piston slidablyarranged in said cylinder, a piston rod interconnecting said camfollower and said piston, a rst valve on said piston adapted to admitfluid to said cylinder below said piston upon movement of said piston inone direction, a second valve positioned on said cylinder adapted topermit discharge of fluid from said cylinder upon movement of saidpiston in an opposite direction, a second stationary wall member securedto said housing and formed to provide a fluid passageway, the lower endof said cylinder including said outlet ports being slidably arranged insaid passageway, and sealing means on said cylinder above said outletports whereby fluid discharged through said second valve is directedthrough said passageway when said cylinder is in said second position.

S. A subsurface pump comprising driving means including a rotatableshaft, a longitudinally movable pump cylinder being formed to provide apump chamber and iluid flow inlet and outlet ports, a piston slidablyarranged in said chamber, a piston rod connected to said piston, meansinterconnecting said piston rod and said shaft adapted to reciprocatesaid piston rod longitudinally upon rotation of said shaft, meansinterconnecting said cylinder and said shaft adapted to move saidcylinder a selected longitudinal distance upon rotation of said shaft,an intake valve on said piston adapted to admit fluid to said chamber onthe intake stroke of said piston, and a discharge valve on said cylinderadapted to discharge iluid from said chamber on the discharge stroke ofsaid piston.

9. A subsurface pump comprising a reversible motor and a reciprocatingpump cylinder having first and second positions, a piston arranged insaid cylinder means interconnecting said motor and said pump cylinderadapted to move said pump cylinder from said first to said secondposition when said motor is actuated in one direction and to move saidpump cylinder from said second to said first position when said motor isactuated in a reverse direction and means interconnecting said motor andsaid piston adapted to reciprocate said piston.

10. A cylindrically configured fluid inflatable packer preformed toprovide a plurality of circumferentially spaced apart, radiallyextending pleats when retracted, said pleats extending substantially thelength of said packer and being formed entirely of elastic material.

1l. A surface operable packer comprising a longitudinally extendinghousing, driving means including a rotatable shaft mounted -in saidhousing, a rotatable cylindrical cam having a helical continuous slotformed thereon affixed to said shaft, a cam follower wheel positioned insaid slot, a rotatable pawl holder connected to said shaft, twooppositely directed pawls arranged on said pawl holder, a firststationary wall member mounted in said housing, a longitudinally movablepawl follower screw threadedly connected to said first wall member, saidpawl follower being formed to provide a key adjacent said pawls, saidpawl holder being mounted on said pawl follower, said pawls beingengageable with and longitiudinally slidable on said key therebyrotating said pawl follower with said pawl holder until said pawlfollower moves a selected longitudinal distance whereby one of saidpawls disengages from said key and said pawl holder rotates free of saidpawl follower, a pump cylinder connected with said pawl holder forlongitudinal movement therewith, said pump cylinder having first andsecond positions and being formed to provide upper inlet and loweroutlet ports, a piston slidably arranged in said cylinder, a piston rodinterconnecting said cam follower and said piston, a first Valve on saidpiston adapted to admit fluid to said cylinder below said piston uponmovement of said piston in one direction, a second valve positioned onsaid cylinder adapted to permit discharge of fluid from said cylinderupon movement of said piston in an opposite direction, a secon-dstationary wall member secured to said housing and formed to provide afluid passageway, the lower end of said cylinder including said outletports being slidably arranged in said passageway, sealing means on saidcylinder above said outlet ports whereby fluid discharge through saidsecond valve is directed through said passageway when said cylinder isin said second position, a packer adapter connected to said second wallmember, an upper packer support secured to said packer adapter, a fluidexpansible packer having one end thereof secured to said upper packersupport, said upper packer support being formed to provide, a pluralityof passageways tluidly communicating with said second wall memberpassageway, a mandrel extending through said packer, a lower packersupport slidably arranged on said mandrel, the other end of said packerbeing secured to said lower packer support and means for reversing saiddriving means in order to reverse the direction of rotation of saidrotatable shaft.

12. A surface operable borehole packer comprising driving meansincluding a rotatable shaft, a longitudinally movable pump cylinderbeing formed to provide a pump chamber and fluid flow inlet and outletports, a piston slidably arranged in said chamber, a piston rodconnected to said piston, means interconnecting said piston rod and saidshaft adapted to reciprocate said piston rod longitudinally uponrotation of said shaft, means interconnecting said cylinder and saidshaft adapted to move said cylinder a selected longitudinal distanceupon rotation of said shaft, an intake valve on said piston adapted toadmit fluid to said chamber, a discharge valve on said cylinder adaptedto discharge fluid from said chamber, a fluid inflatable packer, meansinterconnecting said packer and said cylinder adapted to direct fluiddischarged frorn said pump to said packer to inflate said packer whensaid cylinder is in one position and to permit uid to discharge from thepacker when said cylinder is in another position and means for reversingsaid driving means in order to reverse the direction of rotation of saidrotatable shaft.

References Cited in the le of this patent UNITED STATES PATENTS1,539,242 Carder May 26, 1925 2,334,920 Gosline et al. Nov. 23, 19432,629,446 Freling et al. Feb. 24, 1953 2,654,433 Piety Oct. 6, 19532,681,706 Pottorf June 22, 1954

